Properties of Bulk AlN grown by thermodecomposition of AlCl[sub 3]·NH[sub 3]

Freitas, J.A.; Braga, G.C.B.; Silveira, E.; Tischler, J.G.; Fatemi, M.
September 2003
Applied Physics Letters;9/29/2003, Vol. 83 Issue 13, p2584
Academic Journal
Self-nucleated bulk AlN crystals were grown by thermodecomposition of AlCl[sub 3]·NH[sub 3] vaporized in the low-temperature zone of a two-zone furnace. X-ray diffraction of the AlN crystals show single lines with a small linewidth indicating high single-crystalline quality. Polarized Raman scattering experiments of these samples confirm the x-ray results based on the detection of a small linewidth for all allowed optical phonons. Low-temperature cathodoluminescence spectra show very sharp emission bands close to the optical band gap, which have been assigned to free-excitons A and B, and exciton-bound to shallow neutral impurity. The latter has a full width at half maximum smaller than 1.0 meV. © 2003 American Institute of Physics.


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